How to add lower triangle of zeros/indent to each row, in a matrix?

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Amanda
Amanda 2021-4-25
评论： Amanda 2021-4-25
I have this matrix:
1 2 3 4 5 6 7 8 5 5
3 3 3 3 3 4 4 4 5 5
1 4 3 4 3 4 4 4 5 5
3 3 3 3 4 4 4 5 5 5
And I want this as the result:
1 2 3 4 5 6 7 8 5 5 0 0 0
0 3 3 3 3 3 4 4 4 5 5 0 0
0 0 1 4 3 4 3 4 4 4 5 5 0
0 0 0 3 3 3 3 4 4 4 5 5 5
How can I do this as a script?
Please help
Thank you

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Matt J
Matt J 2021-4-25
编辑：Matt J 2021-4-25
Ran in:
B=[1 2 3 4 5 6 7 8 5 5
3 3 3 3 3 4 4 4 5 5
1 4 3 4 3 4 4 4 5 5
3 3 3 3 4 4 4 5 5 5];
[m,n]=size(B);
result=spdiags(B,0:n-1,m,n+m-1);
full(result)
ans = 4×13
1 2 3 4 5 6 7 8 5 5 0 0 0 0 3 3 3 3 3 4 4 4 5 5 0 0 0 0 1 4 3 4 3 4 4 4 5 5 0 0 0 0 3 3 3 3 4 4 4 5 5 5
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Matt J
Matt J 2021-4-25
You're quite welcome, but please Accept-click the answer to indicate that it resolved the problem.

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